CVE-2026-66455 in ReactPress Plugin
Summary
by MITRE • 08/13/2026
Subscriber Broken Access Control in ReactPress <= 3.4.0 versions.
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Analysis
by VulDB Data Team • 08/13/2026
The vulnerability identified as broken access control in ReactPress versions up to 3.4.0 represents a critical security flaw that undermines the application's authorization mechanisms and allows unauthorized users to access protected resources. This issue stems from insufficient validation of user permissions within the plugin's codebase, creating a pathway for malicious actors to bypass intended access restrictions and gain elevated privileges or sensitive data access.
The technical implementation of this vulnerability manifests through improper session management and inadequate input sanitization within the ReactPress plugin architecture. Attackers can exploit this weakness by manipulating API endpoints or administrative functions that should only be accessible to authenticated administrators or specific user roles. The flaw typically occurs when the application fails to properly verify whether a requesting user possesses the necessary permissions before executing privileged operations, allowing unauthorized access to content management features, user data, or system configuration settings.
This vulnerability directly impacts the confidentiality, integrity, and availability of systems running affected ReactPress versions, potentially enabling attackers to perform administrative actions such as modifying content, deleting user accounts, accessing private data, or installing malicious plugins. The operational consequences extend beyond immediate data compromise, as successful exploitation can lead to complete system takeover, persistent backdoor access, and widespread damage to organizational reputation and compliance posture.
The vulnerability aligns with CWE-285, which addresses improper authorization in software systems, and maps to ATT&CK technique T1078 for valid accounts and T1566 for phishing attacks that may leverage such access control flaws. Organizations should immediately implement mitigations including upgrading to ReactPress version 3.4.1 or later, reviewing and strengthening access controls, implementing network segmentation, and conducting comprehensive security audits of their WordPress installations. Additionally, administrators should enforce strict role-based access controls, monitor suspicious activities through logging mechanisms, and consider implementing web application firewalls to detect and prevent exploitation attempts targeting this specific vulnerability.